viii PREFACE 



which are ahnost entirely devoted to the publication of 

 original work in bacteriology : Zeitschrift filr Hygie'^Ci 

 Annales de PlnstHiit Pasteur, \\\t Jo2irnal of Pathology and 

 Bacteriology , in addition the Hygieiiische Rundschau., the 

 Fortschritte der Medicin, the Archiv fiir Hygiene, the Pro- 

 ceedings of the Royal Society, various medical and veterinary 

 periodicals in this country and abroad, continue, as before, 

 to publish occasional papers on bacteriological subjects. It 

 must be obvious that it is an impossibility to give, even in 

 its essential outlines, an account of all this enormous 

 progress in a small handbook like the present volume, but 

 I have striven to add the more important results of the 

 work of the last decade, principally so far as they refer to 

 the relation of micro-organisms to disease. For this purpose 

 it was found necessary to revise and to rewrite some, and to 

 materially alter others, of the chapters of the old edition. 



A considerable number of illustrations taken from photo- 

 grams have been added ; these have been, for the most part, 

 prepared from my own preparations, unless otherwise stated, 

 by Messrs. A. Pringle and E. Bousfield. 



E. KLEIN. 



March, 1896 



